pioneer

n. 先锋,拓荒者,开劈者
v. 提倡,作先驱,开劈

He was a pioneer in the use of X-rays.

他是最早使用X光的人。

The history of public education in the United States dates from the society of the early pioneers.

美国的公共教育史起源于早期拓荒者的社会。